CN114152710A - Method for detecting total iron content in iron ore - Google Patents
Method for detecting total iron content in iron ore Download PDFInfo
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- CN114152710A CN114152710A CN202111462633.0A CN202111462633A CN114152710A CN 114152710 A CN114152710 A CN 114152710A CN 202111462633 A CN202111462633 A CN 202111462633A CN 114152710 A CN114152710 A CN 114152710A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 160
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000243 solution Substances 0.000 claims abstract description 78
- 239000012086 standard solution Substances 0.000 claims abstract description 40
- 239000012286 potassium permanganate Substances 0.000 claims abstract description 29
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 24
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 24
- 239000012488 sample solution Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 17
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims abstract description 16
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229940099596 manganese sulfate Drugs 0.000 claims abstract description 8
- 235000007079 manganese sulphate Nutrition 0.000 claims abstract description 8
- 239000011702 manganese sulphate Substances 0.000 claims abstract description 8
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims abstract description 8
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 claims abstract description 8
- 235000005074 zinc chloride Nutrition 0.000 claims abstract description 8
- 239000011592 zinc chloride Substances 0.000 claims abstract description 8
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 6
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 6
- 238000004448 titration Methods 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims description 4
- DGXTZMPQSMIFEC-UHFFFAOYSA-M sodium;4-anilinobenzenesulfonate Chemical compound [Na+].C1=CC(S(=O)(=O)[O-])=CC=C1NC1=CC=CC=C1 DGXTZMPQSMIFEC-UHFFFAOYSA-M 0.000 claims description 3
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 12
- JSABTPDNEXHNOQ-UHFFFAOYSA-N n-phenylaniline;sodium Chemical compound [Na].C=1C=CC=CC=1NC1=CC=CC=C1 JSABTPDNEXHNOQ-UHFFFAOYSA-N 0.000 abstract description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000011651 chromium Substances 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- RXWSGRAQODVJEI-UHFFFAOYSA-J [Cl-].[Cl-].[Cl-].[Cl-].[Ti+4].[Zn++] Chemical compound [Cl-].[Cl-].[Cl-].[Cl-].[Ti+4].[Zn++] RXWSGRAQODVJEI-UHFFFAOYSA-J 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229960002523 mercuric chloride Drugs 0.000 description 1
- 150000002730 mercury Chemical class 0.000 description 1
- LWJROJCJINYWOX-UHFFFAOYSA-L mercury dichloride Chemical compound Cl[Hg]Cl LWJROJCJINYWOX-UHFFFAOYSA-L 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of total iron content detection, and discloses a method for detecting total iron content in iron ore, which comprises the following steps: s1, taking an iron ore sample, sequentially adding sodium fluoride, sodium bicarbonate and a hydrochloric acid solution, heating and stirring until the iron ore sample is completely dissolved; adding sodium bicarbonate again, stirring for dissolving, and synchronously cooling to room temperature with flowing water; sequentially adding mixed sulfuric-phosphoric acid and a manganese sulfate solution, and uniformly mixing to obtain a pretreatment solution; s2, heating the pretreatment solution, adding a zinc chloride solution while stirring until the pretreatment solution becomes light yellow, and then continuously heating for 2 min; cooling the solution to room temperature by flowing water, dropwise adding a sodium tungstate solution, and then adding a titanium trichloride solution while stirring until tungsten blue appears in the pretreatment solution to obtain a sample solution; s3, taking a sample solution with the tungsten blue disappeared, dropwise adding an indicator diphenylamine sodium sulfonate, then titrating a potassium permanganate standard solution, and recording the consumption volume V of the potassium permanganate standard solution when the sample solution becomes purple and does not fade within 30 s; and S4, calculating a result.
Description
Technical Field
The invention belongs to the technical field of total iron content detection, and particularly relates to a method for detecting total iron content in iron ore.
Background
At present, the determination of the total iron content in iron ore generally adopts a potassium dichromate titration method of mercuric chloride, the method has strong applicability and high accuracy, but mercury and chromium used in the method are toxic substances, and serious environmental pollution can be caused in the detection process, and even the body health of determination personnel is influenced.
In recent years, more and more reports on mercury-free detection methods are provided, wherein a zinc powder reduction potassium dichromate titration method is a typical mercury-free detection method, but the application and pollution of chromium are not completely eliminated by the method, so that a mercury-free and chromium-free green detection method is provided in the invention.
Disclosure of Invention
In view of this, in order to solve the problem of mercury and chromium pollution in the existing detection method, the invention aims to provide a method for detecting the content of total iron in iron ore.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for detecting the content of total iron in iron ore comprises the following steps:
s1, pretreatment
Taking an iron ore sample, sequentially adding sodium fluoride, sodium bicarbonate and hydrochloric acid solution according to a proportion, heating and stirring until the iron ore sample is completely dissolved;
adding sodium bicarbonate again, stirring for dissolving, and synchronously cooling to room temperature with flowing water;
sequentially adding mixed sulfuric-phosphoric acid and a manganese sulfate solution, and uniformly mixing to obtain a pretreatment solution;
s2, oxidation reduction
Heating the pretreatment solution to 90-100 ℃, adding a zinc chloride solution while stirring until the pretreatment solution turns light yellow, and then continuously heating for 2 min;
cooling the solution to room temperature by flowing water, dropwise adding a sodium tungstate solution, and then adding a titanium trichloride solution while stirring until tungsten blue appears in the pretreatment solution to obtain a sample solution;
s3. titration
Taking a sample solution with the tungsten blue disappeared, dropwise adding an indicator sodium diphenylamine sulfonate, then titrating a potassium permanganate standard solution, and recording the consumption volume V of the potassium permanganate standard solution when the sample solution becomes purple and does not fade within 30 s;
s4, calculating results
Calculating the percentage content of the total iron in the iron ore,
in the formula:
t-total iron titration coefficient;
v, the consumption volume of the potassium permanganate standard solution in mL when the iron ore sample is titrated;
m is the mass of the iron ore sample in g.
Preferably, in the step S1, the mixing mass ratio of the iron ore sample, the sodium fluoride, the sodium bicarbonate and the hydrochloric acid solution is 2: 5: 10: 12.
preferably, in the step S1, the concentration of the hydrochloric acid solution is 1.2 g/mL.
Preferably, in the step S1, the mass ratio of the sodium bicarbonate added twice is 2: 1.
preferably, in the step S1, the addition volume ratio of the hydrochloric acid solution, the mixed phosphoric and phosphoric acid solution and the manganese sulfate solution is 2: 3: 4.
preferably, in the step S1: the sulfur-phosphorus mixed acid solution is formed by mixing a sulfuric acid solution with the concentration of 1.84g/mL and a phosphoric acid solution with the concentration of 1.7 g/mL; the concentration of the manganese sulfate solution is 150 g/L.
Preferably, in the step S2, the concentration of the zinc chloride solution is 25g/L, the concentration of the sodium tungstate solution is 250g/L, and the concentration of the titanium trichloride solution is 1.5 g/L.
Preferably, before the step S3, the potassium permanganate standard solution is added dropwise until the tungsten blue of the sample solution disappears, and the currently added potassium permanganate standard solution is not counted into the consumption volume V in the step S3.
Preferably, the sample solution is allowed to stand at room temperature until tungsten blue disappears before said step S3.
Preferably, in the step S4, the total iron titer coefficient
In the formula:
c (Fe) -concentration of iron standard solution in mol/L;
VT-elimination of iron standard solution upon titrationThe volume of the potassium permanganate standard solution consumed is mL.
Compared with the prior art, the invention has the following beneficial effects:
according to the detection method provided by the invention, a hydrochloric acid solution is adopted to pretreat and dissolve a sample, then zinc chloride-titanium trichloride is used for replacing mercury salt to reduce ferric iron in the pretreated solution into ferrous iron, finally sodium diphenylamine sulfonate is used as an indicator, potassium permanganate is used as a standard solution for titration detection, and a mercury-containing reagent and a chromium-containing reagent are effectively avoided in the whole detection process, so that secondary pollution of mercury and chromium to the environment is effectively eliminated.
In addition, zinc chloride and titanium trichloride are matched under an acidic medium, so that ferric iron can be completely reduced into ferrous iron, the reduction efficiency is high, the reduction effect of chloride ions on potassium permanganate is effectively inhibited, and the accuracy of a detection result is effectively improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Method for detecting total iron content in iron ore
S1, pretreatment
Taking 0.2g of iron ore sample, sequentially adding 0.5g of sodium fluoride, 1g of sodium bicarbonate and 10mL of hydrochloric acid solution with the concentration of 1.2g/mL, heating and stirring until the iron ore sample is completely dissolved;
adding 0.5g of sodium bicarbonate again, stirring for dissolving, and synchronously cooling to room temperature with flowing water;
mixing a sulfuric acid solution with the concentration of 1.84g/mL and a phosphoric acid solution with the concentration of 1.7g/mL to prepare a mixed sulfuric-phosphoric acid solution, sequentially adding 15mL of mixed sulfuric-phosphoric acid solution and 20mL of manganese sulfate solution with the concentration of 150g/L, and uniformly mixing to obtain a pretreatment solution.
S2, oxidation reduction
Heating the pretreatment solution to 90-100 ℃, adding a 25g/L zinc chloride solution while stirring until the pretreatment solution turns into light yellow, and then continuously heating for 2 min;
cooling the solution to room temperature by flowing water, dropwise adding 15 drops of sodium tungstate solution with the concentration of 250g/L, and then adding titanium trichloride solution with the concentration of 1.5g/L while stirring until tungsten blue appears in the pretreatment solution to obtain a sample solution;
and (3) eliminating the tungsten blue of the sample solution by dripping the potassium permanganate standard solution or standing, wherein when the potassium permanganate standard solution is dripped, the currently dripped potassium permanganate standard solution is not counted into the consumption volume V in the step S3.
S3. titration
And (3) dropwise adding 4-6 drops of indicator diphenylamine sodium sulfonate into the sample solution with the tungsten blue disappeared, then titrating the potassium permanganate standard solution, and recording the consumption volume V of the potassium permanganate standard solution when the sample solution becomes purple and does not fade within 30 s.
S4, calculating results
Calculating the percentage content of the total iron in the iron ore,
in the formula:
t-total iron titrimetric coefficient, and
wherein, c is the concentration of the (Fe) -iron standard solution, and the unit is mol/L; vTThe volume of potassium permanganate standard solution consumed in titrating the iron standard solution, in mL;
v, the consumption volume of the potassium permanganate standard solution in mL when the iron ore sample is titrated;
m is the mass of the iron ore sample in g.
In the above-mentioned process for obtaining the all-iron titration coefficient, an iron standard solution was prepared, and V was performed based on the same principle as the above-mentioned methodTDetection of (2):
1) preparing iron standard solution
Weighing 2.1446g of ferric oxide, placing the ferric oxide in a 200mL beaker, adding 125mL of hydrochloric acid solution with the concentration of 1.2g/mL, heating and stirring until the ferric oxide is completely dissolved; naturally cooling, adding deionized water, and adjusting the concentration of the iron standard solution to 6 mg/mL.
2) Oxidation reduction
Heating the iron standard solution to 90-100 ℃, adding a zinc chloride solution with the concentration of 25g/L while stirring until the pretreatment solution turns to light yellow, and then continuously heating for 2 min;
cooling the solution to room temperature by flowing water, dropwise adding 15 drops of sodium tungstate solution with the concentration of 250g/L, and then adding titanium trichloride solution with the concentration of 1.5g/L while stirring until tungsten blue appears in the pretreatment solution to obtain a sample solution;
the tungsten blue of the sample solution disappears by dripping the potassium permanganate standard solution or standing, wherein when the potassium permanganate standard solution is dripped, the currently dripped potassium permanganate standard solution is not counted into the consumption volume V in the step S3;
s3. titration
Taking a sample solution with the tungsten blue disappeared, dropwise adding 2-4 drops of indicator diphenylamine sodium sulfonate, then titrating the potassium permanganate standard solution, and recording the consumption volume V of the potassium permanganate standard solution when the sample solution becomes purple and does not fade within 30sT；
S4, obtaining the total iron titration coefficient,
in the formula:
c (Fe) -concentration of iron standard solution in mol/L; vTThe volume of potassium permanganate standard solution consumed in the titration of the iron standard solution in mL.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for detecting the content of total iron in iron ore is characterized by comprising the following steps:
s1, pretreatment
Taking an iron ore sample, sequentially adding sodium fluoride, sodium bicarbonate and hydrochloric acid solution according to a proportion, heating and stirring until the iron ore sample is completely dissolved;
adding sodium bicarbonate again, stirring for dissolving, and synchronously cooling to room temperature with flowing water;
sequentially adding mixed sulfuric-phosphoric acid and a manganese sulfate solution, and uniformly mixing to obtain a pretreatment solution;
s2, oxidation reduction
Heating the pretreatment solution to 90-100 ℃, adding a zinc chloride solution while stirring until the pretreatment solution turns light yellow, and then continuously heating for 2 min;
cooling the solution to room temperature by flowing water, dropwise adding a sodium tungstate solution, and then adding a titanium trichloride solution while stirring until tungsten blue appears in the pretreatment solution to obtain a sample solution;
s3. titration
Taking a sample solution with the tungsten blue disappeared, dropwise adding an indicator sodium diphenylamine sulfonate, then titrating a potassium permanganate standard solution, and recording the consumption volume V of the potassium permanganate standard solution when the sample solution becomes purple and does not fade within 30 s;
s4, calculating results
Calculating the percentage content of the total iron in the iron ore,
in the formula:
t-total iron titration coefficient;
v, the consumption volume of the potassium permanganate standard solution in mL when the iron ore sample is titrated;
m is the mass of the iron ore sample in g.
2. The method for detecting the content of total iron in iron ore according to claim 1, wherein the method comprises the following steps: in the step S1, the mixing mass ratio of the iron ore sample, the sodium fluoride, the sodium bicarbonate and the hydrochloric acid solution is 2: 5: 10: 12.
3. the method for detecting the content of total iron in iron ore according to claim 2, wherein the method comprises the following steps: in the step S1, the concentration of the hydrochloric acid solution is 1.2 g/mL.
4. The method for detecting the content of total iron in the iron ore according to claim 2 or 3, wherein the method comprises the following steps: in the step S1, the mass ratio of the sodium bicarbonate added twice is 2: 1.
5. the method for detecting the content of total iron in iron ore according to claim 3, wherein the method comprises the following steps: in the step S1, the addition volume ratio of the hydrochloric acid solution, the mixed sulfur and phosphoric acid solution, and the manganese sulfate solution is 2: 3: 4.
6. the method for detecting the content of total iron in iron ore according to claim 5, wherein in the step S1:
the sulfur-phosphorus mixed acid solution is formed by mixing a sulfuric acid solution with the concentration of 1.84g/mL and a phosphoric acid solution with the concentration of 1.7 g/mL;
the concentration of the manganese sulfate solution is 150 g/L.
7. The method for detecting the content of total iron in iron ore according to claim 1, wherein the method comprises the following steps: in the step S2, the concentration of the zinc chloride solution is 25g/L, the concentration of the sodium tungstate solution is 250g/L, and the concentration of the titanium trichloride solution is 1.5 g/L.
8. The method for detecting the content of total iron in iron ore according to claim 1, wherein the method comprises the following steps: before the step S3, the potassium permanganate standard solution is added dropwise until the tungsten blue of the sample solution disappears, and the currently added potassium permanganate standard solution is not counted into the consumption volume V in the step S3.
9. The method for detecting the content of total iron in iron ore according to claim 1, wherein the method comprises the following steps: before the step S3, the sample solution was allowed to stand at room temperature until tungsten blue disappeared.
10. The method for detecting the content of total iron in iron ore according to claim 1, wherein the method comprises the following steps: in the step S4, the full iron titration coefficient
In the formula
c (Fe) -concentration of iron standard solution in mol/L;
VTthe volume of potassium permanganate standard solution consumed in the titration of the iron standard solution in mL.
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| 叶青等: "氯化亚锡－三氯化钛－高锰酸钾 无汞无铬滴定法测定铁", 《冶金分析》, vol. 25, no. 5, pages 94 - 95 * |
| 阴军英;党艳秋;曹允洁;: "铁矿石中全铁含量测定实验的改进", 广州化工, no. 16, pages 125 - 127 * |
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